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G. W. ROBINSON.

Jmprovement in Roofing Nof123,51l. I Patgnted Feb. 6,1872.

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GEORGE W. ROBINSON, OF BENNINGTON, VERMONT.

IMPROVEMENT. IN ROOFING.

Specification forming part of Letters Patent No. 123,511, dated February6,1872.

To all whom it may concern:

Be it known that I, GEORGE W.Ro131NsoN, of Bennington, in the county ofBennington and State of Vermont, have inventeda new and usefulImprovement in Rootin g; and- I do hereby declare the following to be afull clear, and exact description of the same, sufticicnt to enableothers skilled in the class to which my in vent-ion appertains to fullyunderstand and apply the same, reference being had to the accompanyingdrawing which forms part of this specification, in which Figure l. is aperspective view of my improvement in roofing. Fig. 2 is a verticalcross-section through Fig. 1.

Like letters of reference indicate like parts in the several figures.

In the drawing, A represents the boards, which have channels cut intheir upper surfaces, and raised edges. B is a metal strip, whose edgesare bent down and inward, to tit into the grooves or space a a, and thuscover the seams between continuous boards. This strip may be eithersprung on, forced on longitudinally, or the strip may be laid on and theedges bent under afterwards. In the latter case that portion of the woodimmediately below the groove (1. would have to be removed, so that theedges of the strip B could be turned under. The entire roofis made ofboards, substantially as shown in the drawing, or the boards may be onlychanneled at their edges, so as to produce a raised edge, in which agroove, a, can be made. Every seam of the root between the boards iscovered by strips B. The boards run crosswise or up and down like therafters of a building; therefore the spaces between the raised edges actas gutters, or, if preferred, these spaces may be dispensed with. The

countersunk hole 0, shown in Fi 1, is made by. driving the T-headed nail0 down through the seam between the boards, one half of the groove beingmadein each of the two boards. The countersunk space forthe headofthe-nailis made by driving the nail down into the wood. The longT-headed nail C is driven down through strips which run crosswise on therafters, and thus the rooting is held upon the rafters, and these nailsmay be driven along the seams as near together as desired. These nailsnot only hold the roofing upon the rafters, but both prevent the boardsfrom moving longitudinally, and permit them to contract and expand. Itis evident that the strips B can readily expand as the boards contract,or contract as the boards expand, and, therefore, accommodate themselvesto the lateral movements of the boards under cold and heat. I do notlimit myself to a metal strip, B, as other material could be used, as,for instance,

. rubber, felting, &c., without changing the char acter of my invention.A modification of my invention is produced in cutting a slot down andinward toward the seam on each side of the same, and running a bentstrip of metal longitudinally in the grooves and over the seam, and byinserting the nail as before described.

I am aware of a patent in roofing in which there is abent metal strip,and in which the boards are rigidly nailed down, but the nails do notpermit contraction and expansion of the boards as in my invention. I amalso aware ot'a patent in which the bent-metal strip is tacked down tothe boards, and in which the nails that hold the boards down passbetween the boards, said nail having a plate of metal under its head,but this, too, differs from my invention in this, via-that Ido not tackmy strip of metal down, and as the plate and nail-head cannot becountersunk by hammering to permit the bentmetal strip to be pushed onlongitudinally, as in invention.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

The combination of the strip .B, bent under a flange on the boards A A,with the nail O, as and for the purpose set forth.

GEORGE IV. ROBINSON.

Witness s NATHAN K. ELLswoRTH, MELVILLE CHURCH.

